5.. Bjerklin K, Kurol J and Valentin J. (1992) Ectopic eruption of maxillary first permanent molars and association with other tooth and developmental disturbances. The European Journal of Orthodontics 14: 369-375.

25. Bjerklin K, Al-Najjar M, Kårestedt H, et al. (2008) Agenesis of mandibular second premolars with retained primary molars. A longitudinal radiographic study of 99 subjects from 12 years of age to adulthood. The European Journal of Orthodontics 30: 254-261.